What is meant by reversible heat transfer?
What will be an ideal response?
Reversible heat transfer is an approximation to allow for a predictable answer to
heat transfer. Rigorously, reversible heat transfer must only occur over a
differential temperature or differential temperature gradient and must proceed
over an infinitesimally small time interval so that it needs to be fast.
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A board that is 20.0 cm wide, 5.00 cm thick, and 3.00 m long has a density 350 kg/m3. The board is floating partially submerged in water of density 1000 kg/m3. What fraction of the volume of the board is above the surface of the water?
A) 0.350 B) 0.650 C) zero D) 0.200 E) The answer depends on which edge of the board is vertical.
If a string fixed at both ends resonates in its fundamental mode with a frequency of 150 Hz, at which of the following frequencies will it not resonate? (There could be more than one correct choice.)
A) 75 Hz B) 300 Hz C) 450 Hz D) 500 Hz E) 600 Hz
The gravitational force exerted by the Earth on the Moon holds the moon in an orbit around the Earth. Let us assume that the orbit is perfectly circular. The work done by this gravitational force during a one week interval in which the moon moves through a displacement in its orbital path is
1.negative. 2.zero. 3.positive. 4.impossible to determine with the information given.
Two lasers emit equal numbers of photons per second. If the first laser emits red light and the second emits blue light, the power radiated by the first is
A. equal to that emitted by the second. B. greater than that emitted by the second. C. less than that emitted by the second. D. dependent on the time interval of the emission.